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authorFrederic Weisbecker <fweisbec@gmail.com>2008-11-16 05:57:26 +0100
committerIngo Molnar <mingo@elte.hu>2008-11-16 07:55:23 +0100
commit1c80025a49855b12fa09bb6db71820e3367b1369 (patch)
tree063fe72ed9bb3410c3293c83a7882cecc46e7410 /kernel/trace/trace_nop.c
parente6e7a65aabdb696cf05a56cfd495c49a11fd4cde (diff)
tracing/ftrace: change the type of the init() callback
Impact: extend the ->init() method with the ability to fail This bring a way to know if the initialization of a tracer successed. A tracer must return 0 on success and a traditional error (ie: -ENOMEM) if it fails. If a tracer fails to init, it is free to print a detailed warn. The tracing api will not and switch to a new tracer will just return the error from the init callback. Note: this will be used for the return tracer. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_nop.c')
-rw-r--r--kernel/trace/trace_nop.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
index 2ef1d227e7d..0e77415caed 100644
--- a/kernel/trace/trace_nop.c
+++ b/kernel/trace/trace_nop.c
@@ -24,7 +24,7 @@ static void stop_nop_trace(struct trace_array *tr)
/* Nothing to do! */
}
-static void nop_trace_init(struct trace_array *tr)
+static int nop_trace_init(struct trace_array *tr)
{
int cpu;
ctx_trace = tr;
@@ -33,6 +33,7 @@ static void nop_trace_init(struct trace_array *tr)
tracing_reset(tr, cpu);
start_nop_trace(tr);
+ return 0;
}
static void nop_trace_reset(struct trace_array *tr)